参数资料
型号: ATMEGA103-6AI
厂商: Atmel
文件页数: 66/141页
文件大小: 0K
描述: IC MCU 128K 6MHZ A/D IT 64TQFP
产品培训模块: megaAVR Introduction
标准包装: 90
系列: AVR® ATmega
核心处理器: AVR
芯体尺寸: 8-位
速度: 6MHz
连通性: SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 128KB(64K x 16)
程序存储器类型: 闪存
EEPROM 大小: 4K x 8
RAM 容量: 4K x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 64-TQFP
包装: 托盘
配用: ATSTK501-ND - ADAPTER KIT FOR 64PIN AVR MCU
30
ATmega103(L)
0945I–AVR–02/07
an external or Watchdog reset occurs, the source of reset can be found by using the fol-
lowing truth table, Table 8.
Interrupt Handling
The ATmega103(L) has two dedicated 8-bit Interrupt Mask Control Registers; EIMSK
(External Interrupt Mask Register) and TIMSK (Timer/Counter Interrupt Mask Register).
In addition, other enable and mask bits can be found in the peripheral control registers.
When an interrupt occurs, the Global Interrupt Enable I-bit is cleared (zero) and all inter-
rupts are disabled. The user software can set (one) the I-bit to enable nested interrupts.
The I-bit is set (one) when a Return from Interrupt instruction (RETI) is executed.
When the Program Counter is vectored to the actual Interrupt Vector in order to execute
the interrupt handling routine, hardware clears the corresponding flag that generated the
interrupt. Some of the Interrupt Flags can also be cleared by writing a logical “1” to the
flag bit position(s) to be cleared.
If an interrupt condition occurs when the corresponding interrupt enable bit is cleared
(zero), the Interrupt Flag will be set and remembered until the interrupt is enabled or the
flag is cleared by software.
If one or more interrupt conditions occur when the Global Interrupt Enable bit is cleared
(zero), the corresponding Interrupt Flag(s) will be set and remembered until the Global
Interrupt Enable bit is set (one), and will be executed by order of priority.
Note that external level interrupt does not have a flag and will only be remembered for
as long as the interrupt condition is active.
Note that the Status Register is not automatically stored when entering an interrupt rou-
tine or restored when returning from an interrupt routine. This must be handled by
software.
External Interrupt Mask
Register – EIMSK
Bits 7..4 – INT7 - INT4: External Interrupt Request 7 - 4 Enable
When an INT7 - INT4 bit is set (one) and the I-bit in the Status Register (SREG) is set
(one), the corresponding external pin interrupt is enabled. The Interrupt Sense Control
bits in the External Interrupt Control Register (EICR) define whether the external inter-
rupt is activated on rising or falling edge or is level-sensed. Activity on any of these pins
will trigger an interrupt request even if the pin is enabled as an output. This provides a
way of generating a software interrupt.
Table 8. Reset Source Identification
Reset Source
EXTRF
PORF
Watchdog Reset
0
Power-on Reset
0
1
External Reset
1
0
Power-on Reset
1
Bit
7
6
5
4
3
2
1
0
$39 ($59)
INT7
INT6
INT5
INT4
INT3
INT2
INT1
INT0
EIMSK
Read/Write
R/W
Initial Value
0
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